first question: what? i don't get what you just asked
second question: it depends on what your modelling
third question: yes. you can animate anything.
note: i'm well aware that my answers probably aren't the answers you were looking for
you asked a really broad set of questions that requires pages of explanation to get the answers you're actually looking for
so i'm guessing that's why no one has answered your questions yet
that's a "Ch" pronounced as a "K"
Computer skills I should have:
Objective C, C#, Java, MEL. Python, C++, XML, JavaScript, XSLT, HTML, SQL, CSS, FXScript, Clips, SOAR, ActionScript, OpenGL, DirectX
Maya, XSI, Photoshop, AfterEffects, Motion, Illustrator, Flash, Swift3D